The bridge was not scheduled to reopen until Tuesday at 5 a.m., but Ney said unexpectedly good weather had allowed work to progress quickly. "The next time we plan to close the Bay Bridge will be to open the new Bay Bridge, Labor Day weekend 2013," Ney said.

The bridge's upper deck was closed at 8 p.m. Friday to accommodate demolition and maintenance projects related to the construction of a new eastern span. Crews demolished sections fo roadway to make way for an inclined section that will eventually carry eastbound traffic.

The closure has pushed a surge of southbound traffic on to the Golden Gate Bridge.

Unofficial numbers show that more than 67,600 vehicles drove south over the bridge on Saturday, up from 39,799 vehicles on the Saturday of Presidents Day in 2011, Golden Gate Transportation District spokeswoman Mary Currie said.